Abstract:
The invention relates to an apparatus and a method for magnetic flow cytometry, wherein magnetic units (22, 24) are arranged in a flow channel (10) which is configured, with respect to the channel diameter (100) and the surface condition of the channel inner wall, in such a manner that a flow of a complex suspension can be produced in the flow channel (10) with a laminar flow profile (40). The forces (FM) that can be caused by the magnetic units (22, 24) and the forces (FS) that can be caused by the flow, applied to magnetic markers (26) that are not bound to cells, have the effect of holding back said magnetic markers (26) that are not bound to cells in the front channel section (240) and preventing them from continuing to flow along the flow channel (10) via the cell measuring device (20).
Abstract:
In a measuring device, a production thereof, and a use thereof for magnetic flow cytometry, a microfluidic channel is disposed along an enrichment route such that a magnetically marked cell sample flowing through the microfluidic channel is aligned to magnetic guide strips, enriched by the magnetic field of a magnet at the floor of the channel, and guided past a sensor. The enrichment route is thereby implemented with the microfluidic channel on the packaging of the semiconductor chip carrying the sensor. This construction ensures a long enrichment route for high throughput of large sample volumes.
Abstract:
A magnetic flow cytometry apparatus for detection of cells labeled with magnetic nanoparticles has at least one pair of oppositely oriented magnets to provide between the magnets a first magnetic field region with a low magnetic field strength and to provide at poles of the magnets second magnetic field regions with a high magnetic field strength. The magnetic labeled cells provided within a flow input into the magnetic flow cytometry apparatus are enriched in at least one of the second magnetic field regions and supplied to the first magnetic field region, where a magnetic field is applied to the enriched magnetic labeled cells to measure the magnetic relaxation of the magnetic labeled cells in response to the applied magnetic field.
Abstract:
Devices and methods for magnetic flow measurement are provided. Individual analytes are detected in the through-flow, and a dynamic detection of a changing analyte state is carried out, for example with respect to the analyte size or morphology. For this purpose, the analytes to be detected, such as cells for example, are directly marked in the medium surrounding said analytes with magnetic labels and transported through the flow channel of a measuring device comprising at least two magnetic sensors. A characteristic measurement signal is generated by means of the magnetic sensors that are mutually spaced in the flow direction. The magnetic analyte diameter is calculated using the interval between the measurement deflections, and the analyte state can be evaluated using the magnetic analyte diameter.
Abstract:
A measuring device for magnetic flow cytometry has a microfluidic channel disposed along an enriching route such that a magnetically marked cell sample flowing through the microfluidic channel is aligned to magnetic guide strips, enriched by the magnetic field of a magnet at the floor of the channel, and guided past a sensor. The sensor and the magnetic guide strips are integrated on a semiconductor chip.